In the event of a rear-end collision with a certain severity, the active head restraint automatically reduces the distance from the head.
Reduced protective function
Otherwise, the protective function of the active head restraint will be impaired and the personal safety of the occupants will be endangered.
Adjusting the height
Removing
The head restraints cannot be removed.
BMW X3 Service & Repair Manual > Troubleshooting: Instructions for removal and replacement of control units
IMPORTANT:
Disconnecting the vehicle battery will cancel the fault memories of control units.
Consequently, before disconnecting the car's battery, always interrogate the fault
memories. Investigate stored faults and, once any faults have been remedied, cancel the
fault memory. ...